/Engine/Source/Runtime/GeometryCore/Public/Spatial/FastWinding.h
Triangle-winding-number second-order approximation T is triangle, P is 'Center' of cluster of dipoles, Q is evaluation point (This is really just for testing)
namespace FastTriWinding { double FastTriWinding::Order2Approx ( const [FTriangle3d](API\Runtime\GeometryCore\FTriangle3d) & T, const FVector3d & P, const FVector3d & XN, double XA, const FVector3d & Q ) }